FORM 150.66-NM3
ISSUE DATE: 09/25/2020
153
JOHNSON CONTROLS
SECTION 9 - SERVICE AND TROUBLESHOOTING
9
The micro panel is capable of supplying a printout
of chiller conditions or fault shutdown information at
any given time. This allows operator and service per-
sonnel to obtain data and system status with the touch
of the keypad. In addition to manual print selection,
the micro panel will provide an automatic printout
whenever a fault occurs. Detailed explanation of the
print function is given under “Print Key” located in
the Keypad and Display section.
YORK recommends the eld tested WEIGH-TRONIX
model 1220 printer (or former IMP 24). This is a com-
pact low cost printer that is ideal for service work and
data logging.
The WEIGH-TRONIX printer can be obtained by con-
tacting WEIGH-TRONIX for purchase information at:
WEIGH-TRONIX
2320 Airport Blvd.
Santa Rosa, CA 95402
Phone: 1-800-982-6622 or 1-707-527-5555
(International Orders Only)
The part number for the printer that is packaged spe-
cically for YORK is P/N 950915576. The cable to
connect the printer can either be locally assembled
from the parts listed, or ordered directly from WEIGH-
TRONIX under part number 287-040018.
Parts
The following parts are required:
1. WEIGH-TRONIX model 1220 printer.
2. 2.25 in. (5.7 cm) wide desk top calculator paper.
3. 25 ft. (7.62 m) maximum length of Twisted Pair
Shielded Cable (minimum 3 conductor), #18 AWG
stranded, 300 V minimum insulation.
4. One 25 pin Cannon connector and shell.
Connector: Cannon P/N DB-25P or equivalent.
Shell: Cannon P/N DB-C2-J9.
Assembly and Wiring
All components should be assembled and wired as
shown in Fig. 21. Strip the outside insulation back sev-
eral inches and individual wires about 3/8 in. (9.5 mm)
to connect the cable at the microboard. Do not connect
the shield at the printer-end of the cable.
Obtaining a Printout
A printout is obtained by pressing the PRINT key on
the keypad and then pressing either the OPER DATA
key or HISTORY key.
OPTIONAL PRINTER INSTALLATION
FIG. 21 – PRINTER TO MICROBOARD ELECTRICAL CONNECTIONS
Chiller I/O Board
Printer
TB3-3 TXD
TB3-2 CTS
TB3-5 GND
Shield (connect shield to
Pin 5 of the connector)
Do not connect shield
at printer end.
TB3
2 RD
5 CTS
7 SG
LD13278
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